Big Al, you are right. I'm just wondering if the pipe wall is thinner on one side than the other, would that make the thick side's length change more than the thin one. From what I've checked, it may not matter.
So, there's a good chance that a rifle barrel whose bore is off center in its profile will only change in length as its temperature changes. And there'll be no bending at all.
I may not be able to domesticate this wild idea I had.